Duncan John McIntyre was an Ontario lawyer and political figure. He represented Victoria South in the Legislative Assembly of Ontario as a Liberal member from 1883 to 1886.He was born in 1842 on the isle of Tiree, Scotland in 1842, the son of John McIntyre, and came to Mariposa Township, Canada West in 1847 with his family. McIntyre was called to the bar in 1871. He married Margaret Whiteside in 1873. He died in 1920.